13-2 probability distributions and frequency tables
TRANSCRIPT
13-2 Probability
Distributions and Frequency Tables
Frequency Table: a data display that shows how often an item appears in a category
Relative Frequency: the ratio of the frequency of the category to the total frequency
Problem 1: Finding Relative Frequencies
The results of a survey of students’ music preferences are organized in the frequency table. What is the relative frequency of preference for rock music?Type of Music Preferred Frequency
Rock 10
Hip Hop 7
Country 8
Classical 5
Alternative 6
Other 4
What is the relative frequency of preference for• Classical?
• Country?
Type of Music Preferred Frequency
Rock 10
Hip Hop 7
Country 8
Classical 5
Alternative 6
Other 4
Problem 2: Calculating Probability by using Relative Frequencies
A student conducts a probability experiment by tossing 3 coins one after another. Using the results shown, what is the probability that exactly two heads will occur in the next three tosses?
A student conducts a probability experiment by spinning the spinner shown. Using the results in the frequency table, what is the probability of the spinner pointing at 4 on the next spin?
Probability Distribution: shows the probability of each possible outcome
Can be shown using a frequency table
Problem 3: Finding Probability Distribution